CN113373485A - Powder metallurgy copper plating process - Google Patents
Powder metallurgy copper plating process Download PDFInfo
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- CN113373485A CN113373485A CN202110418676.2A CN202110418676A CN113373485A CN 113373485 A CN113373485 A CN 113373485A CN 202110418676 A CN202110418676 A CN 202110418676A CN 113373485 A CN113373485 A CN 113373485A
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- Prior art keywords
- roller
- moving
- copper plating
- tank
- washing
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- 238000007747 plating Methods 0.000 title claims abstract description 95
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 92
- 239000010949 copper Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000008569 process Effects 0.000 title claims abstract description 27
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 26
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 88
- 238000005406 washing Methods 0.000 claims abstract description 87
- 238000004140 cleaning Methods 0.000 claims abstract description 50
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 44
- 238000002845 discoloration Methods 0.000 claims abstract description 24
- 239000002253 acid Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 18
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 239000000243 solution Substances 0.000 claims description 52
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 230000007246 mechanism Effects 0.000 claims description 20
- 238000005238 degreasing Methods 0.000 claims description 19
- 238000011084 recovery Methods 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 238000005554 pickling Methods 0.000 claims description 10
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 claims description 9
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 claims description 9
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 125000003354 benzotriazolyl group Chemical class N1N=NC2=C1C=CC=C2* 0.000 claims description 5
- 239000006184 cosolvent Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 5
- 230000007797 corrosion Effects 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 239000003112 inhibitor Substances 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 238000004649 discoloration prevention Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 20
- 239000007789 gas Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 239000007788 liquid Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000003513 alkali Substances 0.000 description 8
- 239000003518 caustics Substances 0.000 description 8
- 239000004519 grease Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000004945 emulsification Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000007127 saponification reaction Methods 0.000 description 7
- 239000012670 alkaline solution Substances 0.000 description 6
- 238000004506 ultrasonic cleaning Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 239000000839 emulsion Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000010907 mechanical stirring Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 230000037452 priming Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000011012 sanitization Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
- C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/18—Electroplating using modulated, pulsed or reversing current
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/34—Pretreatment of metallic surfaces to be electroplated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/04—Tubes; Rings; Hollow bodies
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention relates to a powder metallurgy copper plating process, which comprises the steps of feeding, moving a roller into an alkaline water tank for alkaline washing, moving the roller into an acid washing tank for acid washing, moving the roller into an electrolytic tank for electrolytic oil removal, and moving the roller into a third cleaning tank for countercurrent rinsing after electrolytic oil removal; moving the roller to a nickel plating bath for impact nickel plating, and simultaneously recovering the residual nickel; moving the roller into a copper plating tank group, moving the roller into a super-washing tank for super-washing, and moving the roller into a sixth washing tank for counter-current rinsing after the super-washing; moving the roller to an anti-discoloration pool for anti-discoloration treatment; and (4) moving the roller out of the anti-discoloration pool, drying, and discharging after drying. According to the invention, the valve seat ring is plated with copper, and the copper coating can reduce the temperature of the valve head by 70 ℃ to the maximum, so that the combustion efficiency is optimized and the emission is reduced.
Description
Technical Field
The invention relates to the technical field of valve seat ring improvement, in particular to a powder metallurgy copper plating process.
Background
The inlet valve and the exhaust valve of the automobile engine are both conical valves, and are composed of a valve head part and a valve rod, and the valve and a valve seat or a valve seat ring are sealed by a conical surface.
The working conditions of the valve are very poor. Firstly, the valve is directly contacted with high-temperature fuel gas, and is heated seriously, and the heat dissipation is difficult, so the temperature of the valve is very high. Secondly, the valve is subjected to the forces of the gas and the valve spring, and to the impact of the valve seating due to the inertial forces of the valve train moving parts. Third, the valve opens and closes at extremely high speeds and reciprocates at high speeds within the valve guide under poor lubrication conditions. Further, the valve is corroded by contact with a corrosive gas in the high-temperature combustion gas. Just because the operating condition of valve is abominable, so need cooperate with valve seat insert the valve, prolong the life of valve.
However, the existing valve seat ring is basically sealed with the valve in a matched mode, but the temperature of the valve head cannot be reduced by the valve seat ring, so that the combustion efficiency is low, and the high cost is caused by using a new product for replacement, so that how to improve the existing valve seat ring to improve the combustion efficiency is an urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a powder metallurgy copper plating process to solve the problem that the temperature of the head of an air valve cannot be reduced by the existing air valve seat ring.
The invention solves the technical problems through the following technical means:
a powder metallurgy copper plating process comprises the following steps:
s1, feeding, namely putting the to-be-processed articles into a roller, wherein micropores are arranged on the peripheral side of the roller; one end of the roller is connected with the rotating mechanism and can rotate under the driving of the rotating mechanism;
s2, moving the roller to an alkali water pool for alkali washing, and moving the roller to a first rinsing pool for countercurrent rinsing after the alkali washing;
s3, moving the roller into a pickling tank for pickling, and moving the roller into a second cleaning tank for countercurrent rinsing after pickling;
s4, moving the roller to an electrolytic tank for electrolytic degreasing, and moving the roller to a third cleaning tank for countercurrent rinsing after electrolytic degreasing;
s5, moving the roller to a nickel plating bath for impact nickel plating, and simultaneously recovering the residual nickel bath solution; moving to a fourth cleaning pool for countercurrent rinsing after recovery;
s6, moving the roller to a copper plating tank group, wherein the copper plating tank group is formed by a plurality of copper plating tanks in parallel into a whole, and moving the roller to the copper plating tank group for copper plating; simultaneously, recovering the residual copper bath solution, and moving the recovered copper bath solution to a fifth cleaning pool for countercurrent rinsing;
s7, moving the roller into a super-washing tank for super-washing, and moving the roller into a sixth washing tank for counter-current rinsing after super-washing;
s8, moving the roller to an anti-discoloration pool for anti-discoloration treatment;
and S9, removing the roller out of the anti-discoloration pool, drying, and discharging after drying.
As a further scheme of the invention: one end of the roller is closed and is fixedly connected with the rotating mechanism, and the other end of the roller is detachably connected with a closed cover plate.
As a further scheme of the invention: both ends of the roller are closed, and openable closing plates are arranged on the peripheral side walls, so that articles to be processed can be conveniently placed in the roller.
As a further scheme of the invention: the temperature of the alkaline water pool in the step S2 is 50-70 ℃.
As a further scheme of the invention: the water solution of the alkaline water tank comprises one of a sodium hydroxide solution, a potassium hydroxide solution, sodium carbonate, a surfactant and a corrosion inhibitor.
As a further scheme of the invention: the temperature of the acid water tank is 20-35 ℃.
As a further scheme of the invention: the method for impact nickel plating comprises the following steps: acid nickel chloride NiCl2 & 6H2O is adopted for nickel plating, cathode movement and a circulating filtration process.
As a further scheme of the invention: the anti-discoloration treatment steps are as follows: soaking the mixture in benzotriazole derivatives and sodium sulfonate cosolvent for 3-5 min.
As a further scheme of the invention: the rotating mechanism may be a servo motor.
As a further scheme of the invention: the ultra-washing step comprises: the ultra-washing is carried out by an ultrasonic device.
The invention has the advantages that:
1. according to the invention, the valve seat ring is plated with copper in an innovative manner, and the copper coating can reduce the temperature of the valve head by 70 ℃ to the maximum extent, so that the combustion efficiency is optimized and the emission is reduced.
2. According to the invention, firstly, the valve seat ring is plated with nickel, and then copper plating treatment is carried out in a plurality of copper plating baths, so that the valve seat ring is plated with copper quickly and efficiently to form a copper plating layer.
3. The invention firstly ensures that the product does not produce mottling by methods of oil removal, acid cleaning and nickel plating, and can better improve the copper plating binding force.
4. In the invention, the saponification and emulsification of the solution on the grease can be accelerated by electrochemical oil removal, and when fine bubbles are separated out from the surface of the material through an oil film, a layer of oil film is adsorbed around the fine bubbles to be separated from the surface of the material and brought into the solution, so that the grease is removed.
Drawings
Fig. 1 is a flow chart of a powder metallurgy copper plating process according to an embodiment of the present invention.
Fig. 2 is a schematic partial structural diagram of a powder metallurgy copper plating production line according to an embodiment of the present invention.
Fig. 3 is another schematic structural diagram of a part of a powder metallurgy copper plating production line according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a roller storage in a reaction tank in a powder metallurgy copper plating production line according to an embodiment of the present invention.
In the drawings:
a passivation tank 701, an alkaline washing tank 702, a first cleaning tank 703, a pickling tank 704, a second cleaning tank 705, an electrolytic tank 706, a third cleaning tank 707, a nickel plating tank 708, a recovery tank 709, a fourth cleaning tank 710, a fifth cleaning tank 711, an ultrasonic cleaning tank 712, a sixth cleaning tank 713 and a copper plating tank 714;
a ventilating duct 8, a first air inlet duct 801, a first air inlet and outlet duct 802, a second air outlet duct 803 and a second air inlet duct 804;
an exhaust assembly 9, an exhaust casing 901, an air suction hole 902, a protective casing 903, and a connecting pipe 904;
a support frame 10;
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, fig. 1 is a flow chart of a powder metallurgy copper plating process according to an embodiment of the present invention; a powder metallurgy copper plating process comprises the following steps:
s1, feeding, namely putting the to-be-processed articles into a roller, wherein micropores are arranged on the peripheral side of the roller; one end of the roller is connected with the rotating mechanism and can rotate under the driving of the rotating mechanism;
the article to be treated is a valve seat ring.
S2, moving the roller to a caustic bath for alkali washing, wherein the temperature of the caustic bath is preferably 50 ℃, and the clearance bath is one or a combination of more of potassium hydroxide aqueous solution, sodium hydroxide, sodium carbonate, surfactant and corrosion inhibitor, and the clearance bath is potassium hydroxide aqueous solution in the scheme of the loosening embodiment; after alkali washing, moving the washed cloth to a first washing tank for countercurrent rinsing;
the function of alkaline cleaning is mainly to remove oil stains, and if the oil stains exist, the later stage of the alkaline cleaning can generate spots on products.
Wherein the counter-current rinsing is: a rinsing mode that the materials and the washing liquid flow in the reverse direction.
It will be appreciated that the water in the first washing tank is flowing and the drum is rotated in a direction opposite to the direction of flow of the water to effect counter-current rinsing to remove the lye.
S3, moving the roller to an acid washing tank for acid washing, wherein the acid washing tank is a dilute hydrochloric acid solution, and the temperature is 20 ℃; after acid washing, moving the roller to a second washing tank for countercurrent rinsing;
s4, moving the roller to an electrolytic cell for electrolytic degreasing, wherein the temperature is 40 ℃; after electrolytic degreasing, moving the workpiece to a third cleaning tank for countercurrent rinsing to remove electrolyte;
electrochemical oil removal not only has saponification and emulsification of chemical oil removal, but also can strengthen the oil removal process. Because the metal product is polarized under the action of current in the solution, the surface tension between the surface of the metal product and the alkaline solution is reduced, the wettability of the deoiling liquid to the surface of the metal product is enhanced, an oil film adhered to the surface of the metal product is further squeezed, and the oil film is easier to break into small oil drops. Meanwhile, a large amount of hydrogen and oxygen are respectively separated out during cathode degreasing and anode degreasing, and the gases violently impact and tear the oil film, so that the oil film is dispersed into a plurality of fine oil droplets to be separated from the surface of the material, and the oil droplets are dispersed into the solution to form emulsion. The gas generated on the electrode also enhances the stirring of the solution on the surface of the material, so that the alkaline solution on the surface of the material is continuously updated, and the oil removal process is enhanced. Thus, the large amount of gas evolved at the electrode during electrochemical degreasing has two effects: firstly, the violently precipitated bubbles play a role in mechanical stirring and stripping, so that the saponification and emulsification of the solution on the grease are accelerated; secondly, when fine bubbles are separated out from the surface of the material through the oil film, a layer of oil film is adsorbed around the small bubbles, and the oil film is separated from the surface of the material and brought into the solution, so that the grease is removed.
S5, moving the roller to a nickel plating bath for impact nickel plating, and simultaneously recovering the residual nickel bath solution; after being recovered, the nickel solution is moved to a fourth cleaning pool for countercurrent rinsing to remove the nickel solution;
the method for impact nickel plating comprises the following steps: acid nickel chloride NiCl2 & 6H2O is adopted for nickel plating, and the cathode moving and circulating filtration process is carried out at the temperature of 20 ℃.
Specifically, the cathode moving and circulating filtration process is a relatively mature technology in the prior art, so the details are not described here.
The bonding force of the copper layer is increased by firstly performing nickel priming.
S6, moving the roller to a copper plating tank group, wherein the copper plating tank group consists of a plurality of copper plating tanks in parallel, and moving the roller to the copper plating tank group for copper plating; simultaneously, recovering the residual copper bath solution, and moving the recovered copper bath solution to a fifth cleaning pool for countercurrent rinsing to clean the copper solution;
in the preferred scheme of this embodiment, the number of copper plating baths is three, and the copper plating temperature is 50 ℃.
In addition, in the step S6, copper is recovered after copper plating, so that resource utilization and recovery are realized;
s7, moving the roller to an ultra-washing tank for ultra-washing (namely ultrasonic washing), and performing ultra-washing at 50 ℃; after the rinsing, moving to a sixth cleaning tank for countercurrent rinsing; wherein the ultrasonic device is used for cleaning through an ultrasonic device, in the scheme of the embodiment of the disclosure, the ultrasonic device with the model of SUS304 is selected, the working frequency is 25kHz, and the power is 6 Kw.
Wherein, the effect of ultrasonic cleaning is for cleaing away the foreign matter, and the sixth washs the pond and is used for cleaing away ultrasonic liquid.
S8, moving the roller to an anti-discoloration tank for anti-discoloration treatment to prevent the workpiece from discoloring at the temperature of 50 ℃;
the anti-discoloration treatment steps are as follows: soaking the mixture in benzotriazole derivatives and sodium sulfonate cosolvent for 3 min.
And S9, removing the roller out of the anti-discoloration pool, drying, and discharging after drying.
Wherein, the drying can be carried out by using a centrifuge or other drying modes, and the dried product can be stored after being dried and cooled at low temperature.
In the scheme of the embodiment of the disclosure, one end of the roller is closed and fixedly connected with the rotating mechanism, and the other end of the roller is detachably connected with the closed cover plate, so that an article to be processed can be conveniently placed in the roller;
or both ends of the roller are closed, and the peripheral side wall of the roller is provided with an openable closing plate, so that the to-be-processed articles can be conveniently placed in the roller.
Preferably, the rotating mechanism may be a servo motor.
In addition, it should be noted that, in order to guarantee the sanitization, first washing pond, second washing pond, third washing pond, fourth washing pond, fifth washing pond are tertiary washing pond, and three washing ponds set up side by side promptly and form.
Example 2
A powder metallurgy copper plating process comprises the following steps:
s1, feeding, namely putting the to-be-processed articles into a roller, wherein micropores are arranged on the peripheral side of the roller; one end of the roller is connected with the rotating mechanism and can rotate under the driving of the rotating mechanism;
the article to be treated is a valve seat ring.
S2, moving the roller to a caustic wash tank for caustic wash, wherein the temperature of the caustic wash tank is preferably 60 ℃, and the clearance tank is filled with a sodium hydroxide aqueous solution; after alkali washing, moving the washed cloth to a first washing tank for countercurrent rinsing;
the function of alkaline cleaning is mainly to remove oil stains, and if the oil stains exist, the later stage of the alkaline cleaning can generate spots on products.
Wherein the counter-current rinsing is: a rinsing mode that the materials and the washing liquid flow in the reverse direction.
It will be appreciated that the water in the first washing tank is flowing and the drum is rotated in a direction opposite to the direction of flow of the water to effect counter-current rinsing to remove the lye.
S3, moving the roller to an acid washing tank for acid washing, wherein the acid washing tank is a dilute hydrochloric acid solution, and the temperature is 25 ℃; after acid washing, moving the roller to a second washing tank for countercurrent rinsing;
s4, moving the roller to an electrolytic cell for electrolytic degreasing, wherein the temperature is 50 ℃; after electrolytic degreasing, moving the workpiece to a third cleaning tank for countercurrent rinsing to remove electrolyte;
electrochemical oil removal not only has saponification and emulsification of chemical oil removal, but also can strengthen the oil removal process. Because the metal product is polarized under the action of current in the solution, the surface tension between the surface of the metal product and the alkaline solution is reduced, the wettability of the deoiling liquid to the surface of the metal product is enhanced, an oil film adhered to the surface of the metal product is further squeezed, and the oil film is easier to break into small oil drops. Meanwhile, a large amount of hydrogen and oxygen are respectively separated out during cathode degreasing and anode degreasing, and the gases violently impact and tear the oil film, so that the oil film is dispersed into a plurality of fine oil droplets to be separated from the surface of the material, and the oil droplets are dispersed into the solution to form emulsion. The gas generated on the electrode also enhances the stirring of the solution on the surface of the material, so that the alkaline solution on the surface of the material is continuously updated, and the oil removal process is enhanced. Thus, the large amount of gas evolved at the electrode during electrochemical degreasing has two effects: firstly, the violently precipitated bubbles play a role in mechanical stirring and stripping, so that the saponification and emulsification of the solution on the grease are accelerated; secondly, when fine bubbles are separated out from the surface of the material through the oil film, a layer of oil film is adsorbed around the small bubbles, and the oil film is separated from the surface of the material and brought into the solution, so that the grease is removed.
S5, moving the roller to a nickel plating bath for impact nickel plating, and simultaneously recovering the residual nickel bath solution; after being recovered, the nickel solution is moved to a fourth cleaning pool for countercurrent rinsing to remove the nickel solution;
the method for impact nickel plating comprises the following steps: acid nickel chloride NiCl2 & 6H2O is adopted for nickel plating, cathode movement and circulating filtration are carried out, and the nickel plating temperature is 30 ℃.
Specifically, the cathode moving and circulating filtration process is a relatively mature technology in the prior art, so the details are not described here.
The bonding force of the copper layer is increased by firstly performing nickel priming.
S6, moving the roller to a copper plating tank group, wherein the copper plating tank group consists of a plurality of copper plating tanks in parallel, and moving the roller to the copper plating tank group for copper plating; simultaneously, recovering the residual copper bath solution, and moving the recovered copper bath solution to a fifth cleaning pool for countercurrent rinsing to clean the copper solution after recovery;
in the preferable scheme of the embodiment, the number of the copper plating tanks is three, and the copper plating temperature is 60 ℃;
in addition, in the step S6, copper is recovered after copper plating, so that resource utilization and recovery are realized;
s7, moving the roller to an ultra-washing tank for ultra-washing (namely ultrasonic washing), and carrying out ultra-washing at 60 ℃; after the rinsing, moving to a sixth cleaning tank for countercurrent rinsing; wherein the ultrasonic device is used for cleaning through an ultrasonic device, in the scheme of the embodiment of the disclosure, the ultrasonic device with the model of SUS304 is selected, the working frequency is 25kHz, and the power is 6 Kw.
Wherein, the effect of ultrasonic cleaning is for cleaing away the foreign matter, and the sixth washs the pond and is used for cleaing away ultrasonic liquid.
S8, moving the roller to an anti-discoloration tank for anti-discoloration treatment, wherein the temperature is 60 ℃;
the anti-discoloration treatment steps are as follows: soaking the mixture in benzotriazole derivatives and sodium sulfonate cosolvent for 4 min.
And S9, removing the roller out of the anti-discoloration pool, drying, and discharging after drying.
Wherein, the drying can be carried out by using a centrifuge or other drying modes, and the dried product can be stored after being dried and cooled at low temperature.
In the scheme of the embodiment of the disclosure, one end of the roller is closed and fixedly connected with the rotating mechanism, and the other end of the roller is detachably connected with the closed cover plate, so that an article to be processed can be conveniently placed in the roller;
or both ends of the roller are closed, and the peripheral side wall of the roller is provided with an openable closing plate, so that the to-be-processed articles can be conveniently placed in the roller.
Preferably, the rotating mechanism may be a servo motor.
In addition, it should be noted that, in order to guarantee the sanitization, first washing pond, second washing pond, third washing pond, fourth washing pond, fifth washing pond are tertiary washing pond, and three washing ponds set up side by side promptly and form.
Example 3
A powder metallurgy copper plating process comprises the following steps:
s1, feeding, namely putting the to-be-processed articles into a roller, wherein micropores are arranged on the peripheral side of the roller; one end of the roller is connected with the rotating mechanism and can rotate under the driving of the rotating mechanism;
the article to be treated is a valve seat ring.
S2, moving the roller to a caustic wash tank for caustic wash, wherein the temperature of the caustic wash tank is preferably 70 ℃, and the clearance tank is filled with a sodium hydroxide aqueous solution; after alkali washing, moving the washed cloth to a first washing tank for countercurrent rinsing; the alkali washing process is used for removing oil stains, so that subsequent finished product treatment is facilitated;
the function of alkaline cleaning is mainly to remove oil stains, and if the oil stains exist, the later stage of the alkaline cleaning can generate spots on products.
Wherein the counter-current rinsing is: a rinsing mode that the materials and the washing liquid flow in the reverse direction.
It will be appreciated that the water in the first washing tank is flowing and the drum is rotated in a direction opposite to the direction of flow of the water to effect counter-current rinsing to remove the lye.
S3, moving the roller to a pickling tank for pickling, wherein dilute hydrochloric acid solution is in the pickling tank, and the temperature is 35 ℃; after acid washing, moving the roller to a second washing tank for countercurrent rinsing;
s4, moving the roller to an electrolytic cell for electrolytic degreasing, wherein the temperature is 60 ℃; after electrolytic degreasing, moving the workpiece to a third cleaning tank for countercurrent rinsing to remove electrolyte;
electrochemical oil removal not only has saponification and emulsification of chemical oil removal, but also can strengthen the oil removal process. Because the metal product is polarized under the action of current in the solution, the surface tension between the surface of the metal product and the alkaline solution is reduced, the wettability of the deoiling liquid to the surface of the metal product is enhanced, an oil film adhered to the surface of the metal product is further squeezed, and the oil film is easier to break into small oil drops. Meanwhile, a large amount of hydrogen and oxygen are respectively separated out during cathode degreasing and anode degreasing, and the gases violently impact and tear the oil film, so that the oil film is dispersed into a plurality of fine oil droplets to be separated from the surface of the material, and the oil droplets are dispersed into the solution to form emulsion. The gas generated on the electrode also enhances the stirring of the solution on the surface of the material, so that the alkaline solution on the surface of the material is continuously updated, and the oil removal process is enhanced. Thus, the large amount of gas evolved at the electrode during electrochemical degreasing has two effects: firstly, the violently precipitated bubbles play a role in mechanical stirring and stripping, so that the saponification and emulsification of the solution on the grease are accelerated; secondly, when fine bubbles are separated out from the surface of the material through the oil film, a layer of oil film is adsorbed around the small bubbles, and the oil film is separated from the surface of the material and brought into the solution, so that the grease is removed.
S5, moving the roller to a nickel plating bath for impact nickel plating, and simultaneously recovering the residual nickel bath solution; after being recovered, the nickel solution is moved to a fourth cleaning pool for countercurrent rinsing to remove the nickel solution;
the method for impact nickel plating comprises the following steps: acid nickel chloride NiCl 2.6H2O is adopted for nickel plating, cathode movement and circulating filtration are carried out, and the nickel plating temperature is 40 ℃.
Specifically, the cathode moving and circulating filtration process is a relatively mature technology in the prior art, so the details are not described here.
The bonding force of the copper layer is increased by firstly performing nickel priming.
S6, moving the roller to a copper plating tank group, wherein the copper plating tank group consists of a plurality of copper plating tanks in parallel, and moving the roller to the copper plating tank group for copper plating; simultaneously, recovering the residual copper bath solution, and moving the recovered copper bath solution to a fifth cleaning pool for countercurrent rinsing to clean the copper solution after recovery;
in the preferred scheme of this embodiment, there are three copper plating baths, and the copper plating temperature is 70 ℃;
in addition, in the step S6, copper is recovered after copper plating, so that resource utilization and recovery are realized;
s7, moving the roller to an ultra-washing tank for ultra-washing (namely ultrasonic washing), and carrying out ultra-washing at 68 ℃; after the rinsing, moving to a sixth cleaning tank for countercurrent rinsing; wherein the ultrasonic device is used for cleaning through an ultrasonic device, in the scheme of the embodiment of the disclosure, the ultrasonic device with the model of SUS304 is selected, the working frequency is 25kHz, and the power is 6 Kw.
S8, moving the roller to an anti-discoloration tank for anti-discoloration treatment, wherein the temperature is 70 ℃;
the anti-discoloration treatment steps are as follows: soaking the mixture by adopting benzotriazole derivatives and sodium sulfonate cosolvent for 5 min.
Wherein, the effect of ultrasonic cleaning is for cleaing away the foreign matter, and the sixth washs the pond and is used for cleaing away ultrasonic liquid.
And S9, removing the roller out of the anti-discoloration pool, drying, and discharging after drying.
Wherein, the drying can be carried out by using a centrifuge or other drying modes, and the dried product can be stored after being dried and cooled at low temperature.
In the scheme of the embodiment of the disclosure, one end of the roller is closed and fixedly connected with the rotating mechanism, and the other end of the roller is detachably connected with the closed cover plate, so that an article to be processed can be conveniently placed in the roller;
or both ends of the roller are closed, and the peripheral side wall of the roller is provided with an openable closing plate, so that the to-be-processed articles can be conveniently placed in the roller.
Preferably, the rotating mechanism may be a servo motor.
In addition, it should be noted that, in order to guarantee the sanitization, first washing pond, second washing pond, third washing pond, fourth washing pond, fifth washing pond are tertiary washing pond, and three washing ponds set up side by side promptly and form.
Specifically, when this disclosed embodiment is applied to powder metallurgy copper facing production line, can include a plurality of reaction tanks that loop through the pipeline intercommunication, a plurality of reaction tanks are in proper order from the initial section to the end section: a passivation tank (namely anti-discoloration treatment) 701, an alkaline washing tank 702, a first cleaning tank 703, an acid washing tank 704, a second cleaning tank 705, an electrolytic tank 706, a third cleaning tank 707, a nickel plating tank 708, a recovery tank 709, a fourth cleaning tank 710, a fifth cleaning tank 711, an ultrasonic cleaning tank 712, a sixth cleaning tank 713 and a copper plating tank 714;
the passivation tank 701, the alkaline washing tank 702, the first cleaning tank 703, the acid washing tank 704, the second cleaning tank 705, the electrolytic tank 706, the third cleaning tank 707, the nickel plating tank 708, the recovery tank 709, the fourth cleaning tank 710, the fifth cleaning tank 711, the ultrasonic cleaning tank 712, the sixth cleaning tank 713 and the copper plating tank 714 are sequentially connected through pipelines.
One side of this production line is provided with pedestrian's passageway, and the opposite side is provided with air pipe 8, air pipe 8 includes first intake stack 801, first intake-exhaust pipeline 802, second exhaust duct 803, second intake stack 804, the air intake of first intake stack 801, second intake stack 804 sets up, the air outlet of first intake stack 801, second intake stack 805 is connected with the air inlet of first intake-exhaust pipeline 802, second exhaust duct 804 respectively, the air outlet of first intake-exhaust pipeline 802, second exhaust duct 804 is connected with external fan respectively.
The first air inlet and outlet pipeline 802 and the second air outlet pipeline 804 are also connected with the air outlet assembly 9.
The exhaust assembly 9 comprises an exhaust casing 901, a plurality of air suction holes 902 and a connecting pipeline 903, the pipeline of the exhaust casing 901 is fixed on one side of the production line through bolts and the like, the exhaust casing 901 is hollow, the exhaust casing 901 is provided with a plurality of air suction holes 902, the air suction holes 902 are used for absorbing generated air, the number of the air suction holes 902 is multiple, preferably 4, and one side of the exhaust casing 901 is communicated with the first air inlet and exhaust pipeline 802 and the second exhaust pipeline 804 through the connecting pipeline 904.
In addition, in order to protect the connection pipe 904 from damage and corrosion, the exhaust assembly 9 further includes a protective casing 903, and the protective casing 903 is disposed on the peripheral side of the connection pipe 904 and surrounds the connection pipe 904.
It should be understood that the number of said exhaust assemblies 9 can be set according to the reaction cells, ensuring that the gases produced by each reaction cell are absorbed.
Furthermore, in the recovery pond, the water pipe passes through solenoid valve control, has placed a plurality of probes in the recovery pond, and this disclosed embodiment uses 4 probes as an example, and when water height overflowed different probes, the water level signal that the probe detected can be sent to the controller in, the switching of controller control solenoid valve to ensure liquid level automatic control.
Of course, it should be noted that the controller may be disposed in a corresponding electrical cabinet, and may be selected according to actual situations.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a roller storage in a reaction tank in a powder metallurgy copper plating production line according to an embodiment of the present invention. It should be understood that FIG. 4 is a reference schematic diagram, wherein the upper part of the rolling device can be suspended on the reaction tank through an attachment structure, and the specific attachment structure can be selected according to practical requirements.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The powder metallurgy copper plating process is characterized by comprising the following steps:
s1, feeding, namely putting the to-be-processed articles into a roller, wherein micropores are arranged on the peripheral side of the roller; one end of the roller is connected with the rotating mechanism and can rotate under the driving of the rotating mechanism;
s2, moving the roller to an alkaline water pool for alkaline washing, and moving the roller to a first cleaning pool for countercurrent rinsing after the alkaline washing;
s3, moving the roller into a pickling tank for pickling, and moving the roller into a second cleaning tank for countercurrent rinsing after pickling;
s4, moving the roller to an electrolytic tank for electrolytic degreasing, and moving the roller to a third cleaning tank for countercurrent rinsing after electrolytic degreasing;
s5, moving the roller to a nickel plating bath for impact nickel plating, and simultaneously recovering the residual nickel bath solution; moving to a fourth cleaning pool for countercurrent rinsing after recovery;
s6, moving the roller to a copper plating tank group, wherein the copper plating tank group is formed by a plurality of copper plating tanks in parallel into a whole, and moving the roller to the copper plating tank group for copper plating; simultaneously, recovering the residual copper bath solution, and moving the recovered copper bath solution to a fifth cleaning pool for countercurrent rinsing;
s7, moving the roller into a super-washing tank for super-washing, and moving the roller into a sixth washing tank for counter-current rinsing after super-washing;
s8, moving the roller to an anti-discoloration pool for anti-discoloration treatment;
and S9, removing the roller out of the anti-discoloration pool, drying, and discharging after drying.
2. The powder metallurgy copper plating process according to claim 1, wherein one end of the roller is closed and fixedly connected with a rotating mechanism, and the other end of the roller is detachably connected with a closed cover plate.
3. The powder metallurgy copper plating process according to claim 1, wherein both ends of the roller are closed, and the peripheral side wall is provided with an openable closing plate.
4. The powder metallurgy copper plating process according to claim 2, wherein the temperature of the alkaline water bath in step S2 is 50-70 ℃.
5. The powder metallurgy copper plating process of claim 3, wherein the aqueous solution of the alkaline water bath comprises one of a sodium hydroxide solution, a potassium hydroxide solution, sodium carbonate, a surfactant, a corrosion inhibitor.
6. The powder metallurgy copper plating process of claim 4, wherein the temperature of the acid water bath is 20-35 ℃.
7. The powder metallurgy copper plating process according to claim 4, wherein the method of impact nickel plating is: acid nickel chloride NiCl2 & 6H2O is adopted for nickel plating, cathode movement and a circulating filtration process.
8. The powder metallurgy copper plating process according to claim 4, wherein the discoloration prevention treatment step is: the anti-discoloration treatment steps are as follows: soaking the mixture in benzotriazole derivatives and sodium sulfonate cosolvent for 3-5 min.
9. The powder metallurgy copper plating process of claim 3, wherein the rotating mechanism can be a servo motor.
10. The powder metallurgy copper plating process according to claim 3, wherein the ultra-washing step is: the ultra-washing is carried out by an ultrasonic device.
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| JPH11193482A (en) * | 1997-12-26 | 1999-07-21 | Japan Energy Corp | Method for preventing discoloration of copper or copper alloy material and copper or copper alloy material |
| CN102492968A (en) * | 2011-12-28 | 2012-06-13 | 尼尔金属(苏州)有限公司 | Copper plating method on brass base material |
| CN104357844A (en) * | 2014-10-29 | 2015-02-18 | 凤城太平洋神龙增压器有限公司 | Overprinting process for impeller of air compressor |
| CN111020659A (en) * | 2019-12-07 | 2020-04-17 | 爱科科技有限公司 | Method for reducing porosity of coating on surface of neodymium iron boron permanent magnet material |
| CN212335343U (en) * | 2020-03-31 | 2021-01-12 | 日照金泰机械制造有限公司 | Surface chromium plating heat treatment equipment for worm |
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2021
- 2021-04-19 CN CN202110418676.2A patent/CN113373485B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11193482A (en) * | 1997-12-26 | 1999-07-21 | Japan Energy Corp | Method for preventing discoloration of copper or copper alloy material and copper or copper alloy material |
| CN102492968A (en) * | 2011-12-28 | 2012-06-13 | 尼尔金属(苏州)有限公司 | Copper plating method on brass base material |
| CN104357844A (en) * | 2014-10-29 | 2015-02-18 | 凤城太平洋神龙增压器有限公司 | Overprinting process for impeller of air compressor |
| CN111020659A (en) * | 2019-12-07 | 2020-04-17 | 爱科科技有限公司 | Method for reducing porosity of coating on surface of neodymium iron boron permanent magnet material |
| CN212335343U (en) * | 2020-03-31 | 2021-01-12 | 日照金泰机械制造有限公司 | Surface chromium plating heat treatment equipment for worm |
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